Use of getListItems

[crashinc99]

I'm trying to traverse a sharepoint site using the api to migrate data from SP into another system. I'm just a small test to retrieve all files in the documents list for a site. I'm able to get all lists, get information about the 'documents' list. However I'm getting messed up with getting the document list items (via getListItems api call). I'm not sure what the filter parameter is used for. I've messed around with leaving filter null, or try to specify a non restrictive filter.

I really could use a good example if you have the time.

Thanks for creating the project!